Im haveing the same problem.. on fresh install the host resolves fine to my ip and its also in the host file but i still have this problem while running the auto installer i'll paste output below
bsdtar 1.02.023, libarchive 1.02.026
Use gtar
/usr/local/bin/gtar
bsdtar 1.02.023, libarchive 1.02.026
Use gtar
/usr/local/bin/gtar
Trying to define super-server internet daemon type... inetd
Trying to check if inetd daemon is running... done
===> Checking for previous installation ... not found.
===> Checking for the necessary system accounts
Checking for the system groups and users necessary for Qmail...
Checking for the group 'qmail'...
Group 'qmail' already exists
Checking for the group 'nofiles'...
Group 'nofiles' already exists
Checking for the user 'alias'...
Trying to add user 'alias'... done
Checking for the user 'qmaild'...
Trying to add user 'qmaild'... done
Checking for the user 'qmaill'...
Trying to add user 'qmaill'... done
Checking for the user 'qmailp'...
Trying to add user 'qmailp'... done
Checking for the user 'qmailq'...
Trying to add user 'qmailq'... done
Checking for the user 'qmailr'...
Trying to add user 'qmailr'... done
Checking for the user 'qmails'...
Trying to add user 'qmails'... done
Checking for the group 'popuser'...
Trying to add group 'popuser'... done
Checking for the user 'popuser'...
Trying to add user 'popuser'... done
done
Checking for the system groups and users necessary for MySQL...
Checking for the group 'mysql'...
Trying to add group 'mysql'... done
Checking for the user 'mysql'...
Trying to add user 'mysql'... done
Checking for the system groups and users necessary for admin server...
Checking for the group 'psaadm'...
Trying to add group 'psaadm'... done
Checking for the user 'psaadm'...
Trying to add user 'psaadm'... done
Checking for the system groups and users necessary for Apache...
Checking for the group 'apache'...
Trying to add group 'apache'... done
Checking for the user 'apache'...
Trying to add user 'apache'... done
Checking for the group 'psaftp'...
Trying to add group 'psaftp'... done
Checking for the user 'psaftp'...
Trying to add user 'psaftp'... done
Checking for the group 'psaserv'...
Group 'psaserv' already exists
Checking for the group 'psaserv'...
Trying to add supplementary group 'psaserv' for user 'apache'... done
done
Checking for the group 'psaserv'...
Trying to add supplementary group 'psaserv' for user 'psaftp'... done
done
Checking for the group 'psaserv'...
Trying to add supplementary group 'psaserv' for user 'psaadm'... done
done
Checking for the group 'psacln'...
Trying to add group 'psacln'... done
Checking for the system groups and users necessary for PostgreSQL...
Checking for the group 'postgres'...
Trying to add group 'postgres'... done
Checking for the user 'postgres'...
Trying to add user 'postgres'... done
Checking for the system groups and users necessary for Mailman...
Trying to Set up right mailman UID/GID (91)... done
Checking for the group 'mailman'...
Group 'mailman' already exists
Checking for the user 'mailman'...
User 'mailman' already exists
ERROR while trying to check the host name
Check the error reason(see log file: /tmp/psa_8.0.0_FreeBSD_6.0_build80060331.13_installing.log), fix and try again
Aborting...
Trying to restart inetd daemon... done
Trying to restart inetd daemon... done
Trying to restart inetd daemon... done
Trying to restart inetd daemon... done
Trying to restart inetd daemon... done
Trying to restart inetd daemon... done
Trying to restart inetd daemon... done
Trying to restart inetd daemon... done
Trying to restart inetd daemon... done
Trying to remove user alias... done
Trying to remove user qmaild... done
Trying to remove user qmaill... done
Trying to remove user qmailp... done
Trying to remove user qmailq... done
Trying to remove user qmailr... done
Trying to remove user qmails... done
Trying to remove user popuser... done
Trying to remove user mysql... done
Trying to remove user psaadm... done
Trying to remove user apache... done
Trying to remove user psaftp... done
Trying to remove user postgres... done
Trying to remove group popuser... done
Trying to remove group mysql... done
Trying to remove group psaadm... done
Trying to remove group apache... done
Trying to remove group psaftp... done
Trying to remove group psacln... done
Trying to remove group postgres... done
done